Internal-combustion engine.



149,1 G. N n" Patented .hum 2:5), l.

2 SHEETSMSHEEI P. AVILLA.

INTERNAL COMBUSTION ENGINE.

APPLICATION FILED DEC- 26| 1916.

f n Y A n) l HY f f v w A d Awww To all whom it may concern.:

Be it known that I, PHILIP AVILLA, a citi z en ofthe United States, residing at thecity and county of San Francisco and State of California, have invented new and usetul Improvements in lnternalombustion Engines, of which the following is a specication.

My invention relates to internal combustion engines, and especially to that class known as twocycle engines, inwhich an explosive chargc is inhaled, compressed, ignited and exhausted ateach revolution of the crank shaft.

.It consists of a hollow piston reciprocated within a working cylinder', a second piston reciprocahle within the first, a crank shaft and connecting rod through which power is transmitted by the action of one piston, a cam and rocker arm connection with the other piston, and intermeslnng gear wheels/by which the movements of the two pistons are made relative.

lt also comprises details of construction which will be more fully explained by ref erence to the accompanying drawings, in whicl1 l Figures l, 2, 8, 4 and 5 are each vertical sections, showing the pistons in different positions during a cycle and showing the connections.

As herein shown, A is a cylinder and B is a case upon which it is supported. Within this case is journaled a crank shaft 2 and a 'parallel shaft 3, each of which has fired u on it an equal sized gear wheel and ist. 'l lese gears intermesh so that they Willtorn together and equally. Within the cylinder A 1s fitted to reciprocate a tubular piston 6, Il@

and within this piston is fitted a second piston 7. The inner piston 1s connectedby a rod 8 with a crank pin 9 upon the dlsk Ll,

and the outerv piston has an extension lugn 10 which is connected by a link 1i withone end of allever arm 12, the other end :of which'is pivoted and fulcrumed upon a pin 13 at the opposite side of the case B; and interrncdlate of the two ends is a roller or 1n Ll `which fits in a cam-shaped groove 15 termed in the `face of they disk 4.

With this construction, it will be seen that as the disks are geared together, when in motion, the crank pin on the disk 4 wlll he revolved in unison with the reciprocatlons of the piston 7, While the piston 6 will have y on memo nooo. retention an, ieee., dpplieation filed December 26, loro.

a movement oit variable speed, caused by the action of the cam 15 through the lever 12,

The operation of the lows: The movements oi the two pistons from the top (onebeing acted onby the crank 9 and the other by the cam l5), will, when both are at the bottom, uncover the lnlet passage 1.6 through which 'acharge of vgas is admitted. The continued movement of the disks causes the .abrupt curvatureof the cam 15 to act through the lever arm l2, so as to force the piston ti up to the end of the cylinder, while regular .crank motion conveyed by the crank 9 'will impel the in ner piston I more slowir, thus causing a separation ot' the pistons dering the op stroke.

it t ansfer port 20 connects the upper end of the cylinder with the space between the pistons, so that as the piston 'i' moves upward the piston 6 will .have 'arrived near the top and the gas will be transferred from the upper part of the cylinder to the space between the pistons, and afterward by the final following movenient ofthe piston 7, the

comprcssed between the pistons. Tlli/'hen the engine will. be as fol? to l aoA

piston 'l has completed the np stroke and the compression ot' the gas is ettcc'ted, an ignition device 18 is energized and the charge is exploded. This explosion takes place when the crank 9 is pessimet the upper center and. causes the piston 'l' to move down yto the end of the stroke, the piston 6 remainn ing at the upper end of the cylinder until the revolution of the disk i has brought the cam 3 into position to act upon the piston G and move it down with greater speed. 'At this time the exhaust ort 19 has been un covered by the piston t' and the downward movement of\-the piston (twill expel the all waste product s \iiccessively through the ports i7 as they register livith the exhaust. port il?. l

lill@ -adinittedthrough the inlet port 16 above the piston 6 during;r the time in which the pistons the cra-nk is passing around its lower are et' curvature.

Fig. 5 shows the piston at the top oil' its stroke, the ports 20 and i7 connectingg'with tot" are at the lower end ot their stroke and While i Lgear ta'and through the cam 15 and arm 12 causes the piston 6 to follow and expel the products of combustion through the port 19. The small amountof gas which may remain above the piston 6 will also escape and' the two pistons will be brought together again at the bottom of the stroke with the inlet passage 16 admitting a new charge of mixture into the cylinder A above the pist0n 6.

`Having thus described my invention, what I claim nd desire to secure by Letters Patent i's- 1. 1n an internal combustion engine, a cylinder having a transfer' port in its side wall adjacent its head, a sparker in the port, a tubular outer piston reciprocal in the cylinder and provided with a solid head having a pocket in its outer face opposing the l cylinder head, said piston also having a port Yao through its side and disposed in such proximityto the piston head as to permit communication through the transfer port with the space between the heads of the cylinder and piston as the latter approaches its inward limit of movement, communication with said piston pocket being shut oti when the'piston is at its inward limitof movement whereby the gases confined within the piston pocket may serve as a cushion for nemesis the piston, an inner piston reciprocal in the outer piston, means for operating the piston, and an inlet and an outlet in the cylinder.

2. In' an'internal combustion engine, a cylinder having a transfer' port in its side wall adjacent its head, a sparker in the port, a tubular outer piston reciprocal in the cylinder and provided with a solid head having a pocket in its outer face opposing the cylinder, said piston also having a longitudinal series of ports through its side, the innermost port being disposed in such proximity to the piston lead as to permit communication through the transfer port with the space between the heads of the cylinder and piston as the latter approaches its in- ,Ward limit of movement, communication with said piston pocket beingr shut oti when the piston is atI its inward limit oi movcment whereby the gases confined within the piston pocket may serve as a cushion for the piston, an outlet in the cylinder over which the outermost piston port-moves when the piston is at its inward limit of travel, an inner piston reciprocal in the outer piston to uncover the outermost port thereof. means connecting the pistons tor timed movement, and an inlet for the cylinder opened and closed by the outer piston.

In testimony whereof l have hereunto set my hand in the presence of two subscribing witnesses.

PHILP A VILLA.

Witnesses:

JOHN H. HnnRrNG, W. W. HEALEY, 

